Question

How does technology rely on the probabilistic nature of quantum mechanics?

Answer 1

Quantum mechanics (QM; also known as quantum physics, quantum theory, the wave mechanical model, or matrix mechanics), including quantum field theory, is a fundamental theory in physics which describes nature at the smallest scales of energy levels of atoms and subatomic particles.

Classical physics, the physics existing before quantum mechanics, describes nature at ordinary (macroscopic) scale. Most theories in classical physics can be derived from quantum mechanics as an approximation valid at large (macroscopic) scale.[3] Quantum mechanics differs from classical physics in that energy, momentum, angular momentumand other quantities of a system are restricted to discrete values (quantization); objects have characteristics of both particles and waves(wave-particle duality); and there are limits to the precision with which quantities can be measured (uncertainty principle).

Answer 2

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The whole point of the schroedinger cat experiment is the absurdity of extrapolating fromquantum to macro or even universe scales.